package com.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;


@WebFilter(urlPatterns = {"/*"})
public class FilterDemo implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("FilterDemo 初始化");

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        System.out.println("====执行前");
        filterChain.doFilter(servletRequest,servletResponse);
        System.out.println("====执行后");

    }

    @Override
    public void destroy() {

    }
}
